This Birnam-based garden honors the legacy of 19th-century children’s book author Beatrix Potter.

This ruined 15th-century hermitage is steeped in myth and mystery.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

A holy well supposedly infused with a saint's spirit flows within this quaint chapel.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

A museum devoted to the science of color.

A real-life Professor Snape once taught in this Welsh university building, which students of course nicknamed “Hogwarts.”

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

This modern labyrinth lies in the shadow of a ruined medieval castle.

Built to hold the worst of the worst of the Nazi war prisoners.

Grotto replete with mystical designs laid out in glued shell mosaics.

An intriguing three-sided folly is a testament to one man's devotion to Catholicism and the number three.

A network of concealed passageways lies within a busy London Underground station.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

A 200-year-old collection of oddities and medical paraphernalia.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

This crumbling folly looks like an enchanted left over from Middle Earth.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

Grab a cuppa at England's first and only domestic tea plantation.